Interference microphone audio signal generated in the transmission process is multifaceted, a common power disturbances, interference between devices, lighting interference. 1, power interference. Power poor grounding, poor contact between devices and ground impedance mismatch, power without the device "purification" treatment, audio cable and AC cord with the pipe, ditch, or with the same bridge laying, will be on the audio signal clutter to form a low-frequency AC "buzzing" sound. 2, interference between the devices. "Howling" occurs between the speaker and the microphone microphone positive feedback caused mainly due to the microphone too close to the microphone away from the speakers or microphone microphone pointing speaker. "Empty sound" is a sonic delay victorious microphone microphone on prices, if both the microphone microphone picking up sound source signal has been amplified signal is restored, or with two different distances from the sound source microphone to pick up the microphone signal with the sound source or a microphone microphone microphone microphone signals picked up by the PA restored after the other, will produce a corresponding difference resulting from the delay. When these signals are superimposed, some frequency components cancel each other TAIDEN microphone microphone, forming a "empty sound." 3, light interference. If using ballast venue started intermittently lights, when the lamp will produce excitation frequency radiation, and its lead in series through a microphone, a "da da" sound; microphone cable wire from the lights too close, there will be "creak" sound. In addition, the outside world will produce high-frequency electromagnetic interference Product Name: New Hand in Hand Wireless Intelligent Conference System Products: Wireless Conference System Series Technical parameters: Host efficiency: 779.100 ~ 819.850MHz 749.850 ~ 779.600MHz vibration mode: PLL PLL frequency synthesis receiving mode: true diversity input impedance: Auxiliary input: 50KΩ series input: 20KG balance: 300Ω output impedance: Imbalance: 400Ω series output: 10Ω maximum input level: LINE: 27dBV Frequency response: 80-20000Hz Products: Wireless RF technology with intelligent mixing perfect combination of technology, both intelligent mixer various functions, such as: speech pattern design, anti-feedback whistle, in series expansion. While both wireless convenience and aesthetics. The new EW-MX440 Each group has 30 selectable frequencies Sennheiser microphone microphone, each machine is equipped with four 120 wireless conference microphone with adjustable frequency group, while increasing the channel ID code, to adequately address the mutual interference between the same occasion can use a greater number. C-MARK microphone microphone, Wuhan conference equipment (certified), microphone microphone provided by Wuhan Engineering Co., Ltd. Jiuhua video. Jiuhua Video Engineering Co., Ltd., Wuhan (www.jowa-tech.com) is a leader in Wuhan, control and adjust the equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs . Wuhan Jiuhua video leadership with the staff warmly welcome all inquiries negotiations to create a better video Wuhan Jiuhua future.